Initialize the booking form when add to cart form is dynamically loaded by fancybox

theme.js.liquid

  // Call Fancybox for product modal + stop scroll to top 
  $('.product-modal').fancybox({
    ajax: {
        complete: function(jqXHR, textStatus) {
            new bta.BookingForm(jQ("form[action^='/cart/add']").not('.bta-active'));
        }
    },    
    helpers: {
      overlay: {
        locked: false
      }
    }
  });